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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85218ea0da8f4bd73558aa5f10131a570dd279626b17cf6d0b85983efc75afc8' 
  AND token = 'uEJwQidsjR0GjGxX0hsydzC6+dPMTRRQ3qGizf8wyLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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