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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02aee40773e72e4d2b6436fd06d834a30f95fcc7553d1f8f069c42892669f033' 
  AND token = 'iTs875ctHJbNwCpYo/j81jweCMyxysor96AVDbQ8o3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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