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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9d06c55c96b6d0755f371f93c95f0ac0215781764ca6f64315907c77e6318cf' 
  AND token = 'R5dRjbXmWdIzaowxjJj+pZaHquF4AyIOIxz8JZdNF3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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