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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4c3ab9089c81b32a8291e1033c53ac73251ca9065b0fae3258f6972eaaaf041' 
  AND token = '3ivUhKEPYevzIw5cbicxMP6jltnoFqnvf107Z/xnbjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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