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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90265a2aec09fabb4c3396a79a0abc594494c912dabb474769f19249a9ac13ca' 
  AND token = 'OrUagFn/3p4GRJYCDyXaCVFPDs0jJ/JTLFrH60d4M+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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