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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c0c6a99fff67441d2d576d0f6aaccc63f12eed01a37ca656eb558bc700bdd75' 
  AND token = 'ul+CI4shIC7YZ0VJcXujHiSJqxydr8KD1b9W+sE8/Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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