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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a5916755df529f66c2ce7c46aa9ce3ce28930783f682972adc4225e8f182023' 
  AND token = 'SUVR53z9CiTkIGb4KFSvE66caWdtZp15YY2F3x59emk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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