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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd47b698a0332d35f1aae914af4b3891462347cd231e57f3c48fdfebe90d3a68' 
  AND token = 'tgah8aEjQ13jZCLUR4t8/ByRE9RgH835gscdYxHhOuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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