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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b263fa0f3319eee94c936beeda02e5956c7ed9da795e1b89912421af95c9aa4' 
  AND token = 'ZD+f1bsOAInErTicH3qkOuUIxOO9lzGqOoDuky9KGqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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