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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '092ba363ed49c3ef6e3c933efa0147ed86e952ac98deac58d97ab8d5376b54ea' 
  AND token = '+wn6BfVLwW+XZytIxytchTqoLPMN7wMNdTRQqTGMppE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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