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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c9fc400ed6aa33ae135f1e10226550a8fadee79dd4185677b10a3180ac23c96' 
  AND token = 'U28fJvU1OMK7agCwKlSH2Wi6iRzdAuDh+RR1JDzzSaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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