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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25cc62b74f8f43e0b195a83a3de556f5ecb1e9977f3d5be4ae8bebf9036ad5f9' 
  AND token = '9eNaFoArb5EQJaKC18YWdqf+D3RbSgSBgPuTcnWQycg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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