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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce8817b33873174f371b4620beb687280a9af066069a5e830bb1d474096d3659' 
  AND token = 'lHifetyUF3pjRBo6hMtS+4bLLt88UN9UqSPC6Pi9tmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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