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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2bf6ab27cdfcbf5f3257b227868a568f64ef4521da1047bad746a7a582b7429' 
  AND token = '8V1SpsO2346NQsSFC58mg6u4Az+UsrDURHv1bl2d+8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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