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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c03e6d4c2c23600e77f16d25429e96745c7ecbd3aad457db8142496094fec59' 
  AND token = '3WqlUMAqeuxurOM8sr3+LYmNKSZQhdOvwClnfMLb5wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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