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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c2886de76ad86eeba1d2d01b1b653831d85d5ade498f7e5b5c44b70dc41d13e' 
  AND token = 'aOMjqayRftaBb+2KbohrP6Wycmrj250oTvZfrFoUH6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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