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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aabe8abd98b8e1167c3f4b6183b7269cd823b5eb1e552230eefa3fa0f019ccd3' 
  AND token = '7iJa6OOcACMe+0duS90+st+IKfP6n1DHAPu2amlHIkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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