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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0b096718714bc85251145b8601f5470f7ae55746e2c78a2968ac0857a80a0f1' 
  AND token = '0BxGpB8ZXV7zHL999gcSInmRsaw9mRrmddLpE13vT/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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