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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c89fa6d0c6a97193055518e75ad4692038d902ddded36dde0a516a0d3b4c2a9' 
  AND token = 'p+qqkto0CPxjHMI+V3aiw10hRQ3yN2QrNlkxNMM061k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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