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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c73236e1f3330ecdff1c6cd719fbea75d949aa38b036eb4b19c6cbc7f2ffbf7b' 
  AND token = 'E/DShhyuqbFhWDId/wG4o2Z19Bkey37950GzxCOb3Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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