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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5be5edb7e825d6ed8d000b632c0c067caae135f35bb89b9daa095493a1cc6c3f' 
  AND token = 'dRRtvVi60UbtLR2Wc2qitQPSnxdk6aDbl1IQ51z9phA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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