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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5c551717ea61c831330c0881afaf0ff2a05fa0e7648f3cfbc00079971ded9ec' 
  AND token = '1v+6Ko9gwiCFa2c4w2IGoDAEOCPvA0La2BMnHRmm79k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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