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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54bd8b0f15d3fd49a86c471101eaafa203d5b96cb813e053727435bf4d9aa753' 
  AND token = 'rzuliV2/+pNvMSvAQasD1HQxV4hjkEmBERC4buM40Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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