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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc7ebe361ee2bb763949d4f0cc51624b5d075ac21f0ecc35794d3073cfbd0057' 
  AND token = 'iF3NVw3SgKqpdSbeLcRUnXl4TEe+T+DzbaSzIHUS1fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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