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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48a9a127f47f312ec028e9754369891ce15a993b5010d6663f149c019cc44126' 
  AND token = 'M3Lal8OFhsoQJh6NIeBAFDhGMhro2SPxM4zfo6UumX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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