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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54a99ce0abcb4c25c1bd40d863de2a13f4856f0fe7d93972ee9580e06a93189c' 
  AND token = '5vrhra66Ul6b6bHB6lGocrICSVzzax4g3FpfwLLW2hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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