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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07562a9d95a73ecf90165bbb049c8ec6daa4b77ff35414630cb5fcceae1c6d2c' 
  AND token = '/TTAb8tWJQy9t9guv3aw5PDULiZVFStdUNjCvPbXnNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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