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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4380e78d2132fb79d996e175319b087e810a6dfcfc6c47a67c5fa5978dd79546' 
  AND token = 'ofwMbfJ8bk4i+lZqejk6jjpp9b143mGCG8u7VdQwD3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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