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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'def69da3347d01b7a1f06d929427e23f7db3d03eb2fdd87a0bccfcc0b364ca5e' 
  AND token = '7E0NJNVp4U+1GeOzbIK8K7xpYHs8A1zEjCIB2qfLo2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}