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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01876dabb61dc94cbf5a334d0486a30d0b34ae0b1700c462ab94f9e5e1609037' 
  AND token = 'IHCpCN/X16/ICTmA324zhXPMbDCdY1kT8oBhiaKAeR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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