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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3bb95db5065e90a2bc2c7b132166f3f6e5eed905d4aa2ed5899c10d98b0d10e' 
  AND token = 'iJhxm00ekFqcg5ou4G8NdMrg+bI5/RfSLbuh+/NnHjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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