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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b1632a989b752429e790b7fa36ef34b870a3bcd3a665425a0edbc742791ebc8' 
  AND token = 'g+e38MLKX5P1oB6GaKdI9U4/pG6F7eG4Q7sD7BscAaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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