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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7af89a0b675bb27f6af7dbf3030005e72a176d159666e86ef980dbf7713eec79' 
  AND token = 'ZV2M1wDr4+8O+6czQbKY5f909JyDqCnEydtHQzVjV70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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