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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba134396468b36d589e2b7dfdf66105bec3abc71ba2630cfb3adbf6245c16a0d' 
  AND token = '5t7qopha5pEado01m3UMuf0bkV5uN03D103SFdh6AgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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