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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcce3a7f20a188bbcfd2e6e1eea4d401353431f933586d6ecf56ea9b64894a02' 
  AND token = '2C/RArNiyaTyw3kX3vGPTSnEYNq8LUwGipuMeozqex8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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