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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '787161abecb44a8f6f9f7dacb0bd5e4562ba2c9d2d023079db58c6753c591edc' 
  AND token = 'c9uLdaFNBuIDutwOaefapjw5Deg9hLO20iwlSFRhf88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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