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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea9e1475f1004b23bfdfb6884d3f3af62b6a39af5689945acc1320fad769eaf' 
  AND token = 'f76+7JXfZK22g9syjNXV4t0oo8AzP2L5MfNcxZdVoZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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