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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e5bbab971a061a118d21110ebb586cd025b0b0e9d4f1997f44cfaf3aab37fd6' 
  AND token = 'J7jThr/36cjg9yr/bFiJTKdgwkT0S/t+yMpXbo5Q1Ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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