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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db7dd8738fc812a9b1ac8adf458d121c5dc1fbc6def3f8a5110f059b06399ae5' 
  AND token = 'FuPOlr7RYIotvF3TPkv2FV4z0x7a1Xi/s6yCANBeR/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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