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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f62cbd05ef93112c199aef72a142b531eb045ee7aeac94dd16f96e6f8ce24fcf' 
  AND token = '6xKjB3Xf4ZnooMTat2uEbL7fQDKLn7YRDGVOJX/+hV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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