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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '141fa059a765214e779416403b3566309767d35948385b54d5c2c5d6e3e84cb9' 
  AND token = 'b9vV43hLhAuOWgUZU/DMS5IZfgl1euNS/dVo5aoQYlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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