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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93c28c88292e454ecf7fa8b345a9afc1cf3a9d0edfa29570d25c96936d90ce6' 
  AND token = 'RDtNVP4uFxe98tjCaVIK3LXR2/l/8khfYmz1EFieNc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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