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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d94f197bfb7f4c56dc72e0cf3836c943cfc802293f9a394fc33df186b4b0c1a' 
  AND token = 'EzCwTOGolYJDXee5ZT2030jStSZS4P4E0mQN9jM3Hok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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