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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbf8af68a6b0c3ed20f3c03c80fb0bf6cbe2b0469f427e9a6d46b81bb1a5107a' 
  AND token = 'tcEOmenRBE7H0u5sNSY8ZLWmvJa0dGtk0paXpwJ/kKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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