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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78ec1e719393158bb41c494da5cf1b78f8af3ba3151aac5391c6704e3dc72570' 
  AND token = 'e+Ki+ZxJWITQdbNCykAQU9OpLTe16A7Cc6RAVslr6JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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