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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeff40fa6377b099a17c6f8cb8bcf27b0ba1c4f5a839f72e635fe06c5cb2b55b' 
  AND token = 'EYdVaG/AGnEb/5oWloP/a8biLQ3HeUkyyJO4ax63zwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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