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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3d519ba6353d2331261107dde3f42a3602efca87fdb8625a4549d22fa4a79be' 
  AND token = 'xEq/eSy3oA2T0zUpOCNhcAsy9pbvKQT5L1KBzYe2P2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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